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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1c442e849235481acca145c92e98560bc3cc413c5da8f29fbeb926b216e40be3' 
  AND token = 'auhuvdUut4MoRTC4WEPO0ECzVJ7J27+NSHTyadmf0FI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}